Semiprimes of the form k^3 - 1.

Terms

a(0) =26a(1) =215a(2) =511a(3) =1727a(4) =2743a(5) =7999a(6) =13823a(7) =54871a(8) =157463a(9) =238327a(10) =511999a(11) =728999a(12) =1330999a(13) =2628071a(14) =3374999a(15) =4410943a(16) =4741631a(17) =7077887a(18) =7301383a(19) =20123647a(20) =21484951a(21) =30959143a(22) =36594367a(23) =42144191a(24) =63044791a(25) =64964807a(26) =81746503a(27) =124999999a(28) =187149247a(29) =264609287